Relatively Small Quantities of Neuropeptides Are Required for Signaling, in Part

question 4

Multiple Choice

Relatively small quantities of neuropeptides are required for signaling, in part because

• A) they have a much higher affinity for their receptors than low-molecular-weight transmitters.
• B) they are synthesized so quickly that a continuous supply is available.
• C) one molecule can typically bind to many receptors at a time.
• D) the binding sites are extremely close to the release sites.
• E) their metabotropic receptors can amplify the signal through intracellular pathways.